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  1. #1

    Default 5.3 slow to start when at operating temp.

    I have a 2000 Silverado with 75,000 miles on it. No trouble at all for 10 years with normal maintenance. Now it starts fine when cold, but after driven and warmed to operating temps, it takes 3 or 4 attempts to get it to start. After it starts, it runs fine. The fuel pressure at the manifold is 50 psi and it displays no trouble codes when scanned. I've never changed the fuel filter, but don't know if that would be a factor since it appears I'm getting enough pressure. Could this problem be a temp sensor, or throttle position sensor? Any thoughts would be appreciated.

  2. #2

    Default RE

    That weird that your getting enough pressure but it wont start til a few clicks. Mine does that same thing but my pressure is like at 24, and i need to repalce my fuel pump for sure. Hopefully that will help me with the pressure. Hopefully some here has a answer
    2001 Silverado 5.3L
    13% tint all around
    7" Fabtech lift kit w/ leveling kit
    HD front end conversion
    Blacked out Billet Grille w/ Black Bow-Tie
    33x12.5x20 on 20x10 Fuel Hostage
    Smoked out tail lights
    Dual Flow Masters/ Exhaust Cut outs
    K&N CAI
    Custom Tuner
    Corvette Servo
    180 Stat
    10K HIDs

    "Spending money on things we dont need to impress people we dont know"

  3. #3

    Default same

    My 2000 with the 5.3 does about the same thing. It always starts fine cold, but after its warmed up it will just keep cranking and never start (ok, it might start after some cranking 10% of the time). But, it ALWAYS starts immediately the 2nd time I try it.

  4. #4


    It was the FUEL PRESSURE REGULATOR. There were two different styles, mine was the earlier of the two. You can look on Rockauto to see photos of them. One way to tell if yours is bad is to pull off the vacuum line to it and see if there is any fuel in (the line). If so, the diaphragm in the regulator is toast and allowing fuel to pass thru and out the vac line. A new Delco Fuel pressure regulator costs about $60-$75. Not cheap, but easy to replace and fixed my problem. Back to starting quick on first try. Hope this helps. Someone else clued me in on this fix. Might check the fuel filter if it hasn't been replaced.

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